Please tell me how to set the BIST Loopback value in register

Hello,

As far as I know, the iio_reg values reset after power cycle, so you should automate the confguration on startup.

Try writing these commands before exit 0 in /etc/rc.local:

iio_reg cf-ad9361-dds-core-lpc 0x3F4 0x03 # Enable BIST, inject at RX input

iio_reg cf-ad9361-dds-core-lpc 0x3F5 0x02 # Enable RF loopback

Also, you can check this document: (+) AD936x Built in Self Test (BIST) - Documents - Design Support AD9361/AD9363/AD9364 - EngineerZone.

Regards,

Stanca

Thanks for reply!

Unfortunately, my device does not have rc.local in /etc/rc.local.
Can you tell me if there is another way to do this?

Hi, /etc/rc.local is a script designed to run after Linux boots. If you use Kuiper Linux, appending these commands to that file/script could help fix the loopback behavior. Best, Stefan   

Hi!

Sorry for the long reply.

As far as I understand, in my case, in order to make any permanent changes, it is necessary to change the Linux image that is used to manage my AD9363.The fact is that the Linux image is loaded at startup, and therefore any changes made during the session will be lost upon reboot.

Thanks you all for you help.